By E. H. Sonnenblick (auth.), F. V. McCann (eds.)
Read or Download Comparative Physiology of the Heart: Current Trends: Proceedings of a Symposium held at Hanover, New Hampshire (USA) on 2 to 3 September 1968 PDF
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Extra resources for Comparative Physiology of the Heart: Current Trends: Proceedings of a Symposium held at Hanover, New Hampshire (USA) on 2 to 3 September 1968
Example text
24 C. FRANZINI-ARMSTRONG and K. R. PORTER, Nature 202, 355 (1964). 25 J. W. SANGER and F. V. McCANN, J. Insect Physiol. 14, 1839 (1968). 26 L. FwREY, Proc. R. Soc. [B]166, 375 (1966). 27 F. V. McCANN, J. comp. biochem. Physiol. 13, 179 (1964). 28 J. W. SANGER and F. V. McCANN, J. Insect Physiol. 14, 1539 (1968). 29 D. B. SLAUTTERBACK, J. Cell Bioi. 18, 367 (1963). 30 M. C. LEDBETTER and K. R. PoRTER, J. Cell Bioi. 19, 239 (1963). 31 L. G. TILNEY and K. R. PORTER, Protoplasma 50, 317 (1965). 32 L.
The former appear to be larger and less regular in shape and density, characteristics that require further analysis. In the aortic bulb there is a further change in structure (Fig. 11). The quantity of supporting collagen is increased and there is now a paucity of nerve fibres. Extensive branching of the muscle cells gives rise to finer processes that make contact with adjacent fibres and may be nexuses. Although this 'unitary' type of muscle is known to characterize the heart of the oyster 32 , nexuses have not been observed in the cardiac muscle of Achatinidae.
Col. v eon. col. con. col. T lillilililiillttllllllllllllllllllillllilliiliillllllltllllllll are independently variable frequencies of auricular and ventricular systole, the two chambers behaving as though they were in some degree subject to independent control. The gross morphology and innervation of the Achatinid heart is similar to that of Helix pomatiaao. There are no valves in the pallial vein at or near to the auricle, nor is there a pallial-auricular valve. A pair of auriculo-ventricular valves guards the junction of the two heart chambers and there is a single valve Functional Correlates in Heart of Achatinidae A 49 B Fig.